Blasting cartridge



July 9, 1940. c. J. SANDOE BLASTING CARTRIDGE Filed May 4, 1936 PatentedJuly 9, 1940 amazes 2,297,205 naas'rma mammals Giarence i. Sandoe,University City, Mo., as-

signor to Carrion Corporation, a corporation of Illinois Application May4,1936, Serial No. 77,725

My invention relates to blasting cartridges, particularly cartridges foruse in the mining of coal and employing carbon dioxide or compressed airas the blasting medium. The invention has as its principal object ablasting cartridge which will remain in the blasting recess.

The invention consists principally in the provision of an annularperipheral flange at or near .the end of the cartridge that is foremostin the blasting recess, this rib fitting closely in the blasting recess,whereby the force of the blast tends to push the cartridge further intothe recess instead of forcing it backwards out of the recess as is nowcommonly the case. The invention further consists in the blastingcartridge and in the parts and combinations and arrangements of partshereinafter described and claimed.

In the accompanyin drawing,

Fig. l is a side elevation of a blasting cartridge embodying myinvention shown in place in the blasting recess of a bed of coal,

Fig. 2 is an' enlarged view of the front end portion of said cartridge;

' Fig. 3 is a sectional view onthe line 88 in 25 Fig. 2, I

' Fig. 4 is an elevation of the end portion of a modification of theinvention,

Fig.. 5 is an elevation of the end portion of another modification,whose rib is provided with a sealing washer,

Fig. 6 is a sectional view on the line BB in Fig. 5,

Fig. 'l is anelevation oi the end portion of a cartridge having amodified sealing washer arrangement, and

Fig. 8 is a sectional view on the line 8-8 in Fig. .7. Y Y

The drawing shows an external view of a blasting cartridge, which mayuse any desired blasting medium, carbon dioxide and compressed air beingtwo blasting mediums commonly employed. The nature of the blastingmedium and the details of the method and mechanism for setting off thecharge are immaterial and form no part of the present invention which isconcerned with the holding in the blasting recess of any type ofblasting cartridge, regardless of the blasting medium employed.

In Figs. 1-3 is illustrated a cartridge I of con- '50 ventional typearranged in a blasting recess 2 in a coal body 3, the recess 2 being ofsomewhat larger diameter than the body portion of the cartridge. Myinvention is concerned with the provision of an annular rib i at or nearthe end 55 of the cartridge that is foremost in the blasting recess,Figs. 1-3 illustrating such a rib d welded to the head portion 5 or saidcartridge near the rounded end thereof, forwardly of the obliquelyarranged openings 8 through which the blasting gases pass into the coalbody 8. The rib 4 is of 6 such outside diameter as to pass through theblasting recess 2, but to fit closely enough therein to prevent thegases from passing forwardly of said rib. By this arrangement, thedischarge blast has a tendency to force the cartridge fur- 10 therforward into the recess, it being noted that the rib 4 creates an areafor the forward pressure of the gases that is larger than the area onwhich the rearward pressure of the discharge blast can act. The rib 4prevents the blast gases from working forwardly of the head 5 of thecartridge and thus exerting a pressure on the front end to force thecartridge from the recess. The oblique arrangement of the openings 6 notonly initially directs .the discharge of the blast away from the end ofthe cartridge which is provided with the sealing rib tolessen thesealing operation which must be performed by the rib d but the force ofthe discharging blast toward the outer end of the cartridge alsoproduces a re- :5 action tending to hold the cartridge in the recess. Inother words, the high pressure blast of gases issuing out of therearwardly inclined discharge openings at high velocity will react uponthe surrounding walls of the recess, producing a 80 resultant forcetending to project the entire cartridge further inwardly toward theclosed end of the recess. I

As illustrated in Fig. 4, the head of the cartridge is provided with aprojecting stem 20 at 85 the end of which is a disk 2| of largerdiameter than the body of the cartridge, this disk having the samefunction as the rib 4. A

In Figs. 5 and 6 is illustrated a modification wherein the blastingcartridge has a flat frontdll face and a projecting annular rib 4b isformed integral with the cartridge.

A sealing washer 3| of any desired construction may be secured to therib 4b, Figs. 5 and 6 showing the washer 3i mounted against the rearface of said rib 4b. This washer has a rearwardly facing skirt portion32. The forward pressure oi the blast gases ,will crowd the sealingwasher into thespace between-the'rib and the blasting recess, therebysealing off the forward end of the recess against the entry of blastgases.

In the modification shown in Figs. '7 and 8,

a sealing ring 40 has an inturned flange portion 4| overlapping the headof the cartridge and secured in place by means of a plate 42 riveted orotherwise secured to the head of the cartridge.

All of the above described constructions provide an enlarged portionthat is seated in the blasting recess and sealed to prevent the blastinggases from working forwardly of thecartridge. The rib alone makes asatisfactory seal under most conditions, so that thersealing washer maycommonly be dispensed with. The cartridge is effectively held in theblasting recess against any rearward movement. It is noted that byreason of said rib, the area against which the forward pressure of thegases can work is considerably larger than the area against which therearward pressure of the gases can work, so that the whole tendency ofthe blast is to force the cartridge deeper into the blasting recess.

Obviously, the invention is applicable generally to blasting cartridgesof various types, regardless of the blasting medium and blasting methodsemployed; so that I do not wish to be limited to the details 01'construction above shown and described.

ing charge is released in the general direction of the remaining end ofthe container, and blasting charge sealing means of greater effectivediameter than and attached to the first mentioned and of'the containeron the side of said discharge orifice away from the direction of releaseof the charge, said sealing means being constructed to substantially fitthe bore hole and thereby prevent the blasting charge from working pastthe said means,'said sealing means and oblique discharge orifice servingto prevent a tendency for said cartridge to be forced out of the borehole upon release of said charge when the cartridge is placed the bottomthereof.

CLARENCE J. SANDOE.

